Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
cua thong » cua thuong, cua khong, cua tong
thong van » trong van, thong va, thong quan
doc hieu » toc thieu, hoc thieu, hoc hien
hanh ban » thanh ban, hang ban, hanh han
hanh san » thanh san, khach san, thanh son
van tan » van tuan, van ban, van tai
tan cao » toan cao, tao cao, tay cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((hanh ban) or (hanh san)) cua thong thong van tan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((hanh ban) OR (hanh san)) cua thong thong van tan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((hanh ban) or (hanh san)) cua thong thong van tan cao*.